diff --git a/setup b/setup
index 275236cd3..0028eac0f 100755
--- a/setup
+++ b/setup
@@ -30,6 +30,11 @@ case "$(uname -s)" in
   MINGW*|MSYS*|CYGWIN*|Windows_NT) IS_WINDOWS=1 ;;
 esac
 
+# Windows: binaries are compiled with .exe suffix
+if [ "$IS_WINDOWS" -eq 1 ]; then
+  BROWSE_BIN="$SOURCE_GSTACK_DIR/browse/dist/browse.exe"
+fi
+
 # ─── Symlink-or-copy helper ───────────────────────────────────
 # On macOS/Linux: create a symlink (existing behavior).
 # On Windows without Developer Mode (MSYS2/Git Bash): plain ln -snf silently
@@ -243,6 +248,11 @@ migrate_direct_codex_install() {
   INSTALL_GSTACK_DIR="$migrated_dir"
   INSTALL_SKILLS_DIR="$(dirname "$INSTALL_GSTACK_DIR")"
   BROWSE_BIN="$SOURCE_GSTACK_DIR/browse/dist/browse"
+  # Windows: binaries are compiled with .exe suffix (same as the top-level
+  # BROWSE_BIN assignment — this re-derivation must not drop the suffix).
+  if [ "$IS_WINDOWS" -eq 1 ]; then
+    BROWSE_BIN="$SOURCE_GSTACK_DIR/browse/dist/browse.exe"
+  fi
 }
 
 if [ "$INSTALL_CODEX" -eq 1 ]; then